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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd0f931367034122c574a0b51db9b4e8c65d063cefbdeb7609bbfc4ca8ec7f9' 
  AND token = 'CZuX2nBAxay6S77bttskbG8Uz4Zj+zKuMus9LmcNtX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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