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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ab74eed8ca89f8f472972baa97b5eca2c5cc9735fae0d96e9e4c9c578d7bb4' 
  AND token = 'b7DcicimJiy3SQSnPXQnW5GSHcLIpbR+et9uhPK0XzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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