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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf317d42c0b5ef40914e62a2dafd916dde3fa92e9c0045261be2484c93035e5' 
  AND token = 'Y6qj52kA+ciixujnGjghAWut/Tla8yjcB038DMK+jH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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