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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82f0ef7b8c871814bb6e09b70bba55eea97e3b219c1ccf9f55628a64755150d' 
  AND token = 'FJ1fAJP32iGJ9Y2J1OniIN1qVTPWfT4/qU0K7PQGVwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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