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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aee53a7c30c8f11846e6e0031a1da4a5cd0f6b909091248ffea9da03ba6a18b' 
  AND token = 'WU1KeYnzxnTE1meyTGKDlY81A99gczoCBz3VSkzM1Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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