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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b7599590f2975f960d55467dd988166d9cea6cd15de9ef97964af55523fb8a' 
  AND token = 'dLsTfdaDRz4HY3+4A/PGu84SmogdelUl9LKp0/LI2mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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