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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce812b189f20f84ad72eae2e9027857c41ba51771277e0c4d08c55af679e141' 
  AND token = 'XM9HKb7oxMU68yj0s+JhWcfrP/2cxjXNmTqQ87cXxjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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