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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ebf7c5d9705854031b2028b59e8346a12a36e4c6863dbdf6c778ba96c1508' 
  AND token = 'RSO9h/SxDkXSCvf54mfq8MuEEKE7nNum3Ob3mJ7SjnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00233

JSON explain

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