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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1790ce5f98c011cd98a8e8d28eb08025404af7b79eb4b9856c0925ff646ba68a' 
  AND token = 'TUfp7EvlFvmP7B1bHuQKuxG7/BnMhoQPky8dPuYK9MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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