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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c218f0c99c1502f7cb8338ec185a7f0ec1e8434ff6917ed962904ef5a6e5ce7b' 
  AND token = 'MqcK0SRc5D9tEPasIflYUhcgBCz24LmygMpENjiLvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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