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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cbb0c115cf1255f6a2a87250c5a1604909535cd8c3b8e091d21fa8208ebd1a' 
  AND token = 'EmqT4BVF3qClp0S/9rqE4TSo68A6Gjy2L+ujuqe5hJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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