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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a2c26092b90cb6a117325cd8067b999499e07c9243ad66c6ca7c38452631ee' 
  AND token = '4vQIfcNcTen9O4j4VHPJ/0pByr2Uv9PKA2sOuB1sRew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}