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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dd53d5255e1e02104cb7a80a114d8b6fe5443d7a8d236c4c11df8ea68837ee' 
  AND token = 'qKqZ2ZtbGwVwkhga4vJ0aLWODRNdbeiBUE6P6Kd9VkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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