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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c95f1b3934690ce39e94b642342bc96d514990ae410cba2ca6f13b98f2247c2' 
  AND token = 'fRHe2l4D76Ap94N/fLFKWhzXQQnWTFwtIMEupABk1Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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