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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c7be73dd89d9507b6c7bf700b7b3c05e0a307117b42b7d9793ddbdf9e217a8' 
  AND token = '5HtQ1ZMWXJn+6GT8flsVwZ/fk5cXfq6F0Vb1pRP1nDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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