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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7658bce2c80d25063a91886ec2a06b7124bed503d5986efd0282af48b5abcdd' 
  AND token = 'rnD5AfHqT2Y1/EIJOuJestsBMAg+ZReAV5auIbA02xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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