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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b52936d37e10192e61ffe5b5e070ed3e6e53d9ee7776c507d418151790111a6' 
  AND token = 'pZ9qZr6O4jVZ1MdgnodZIgNHIvZQhYqmHnXAC58ZWgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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