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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eb18ba2e56f1b11609c555c18199568fd7482b787f59492bac6ccdf36eb4b7' 
  AND token = 'EtIxK/zq3Rj+V7RGey4ceQ4ldu2OfvoFz3MtvfgyCAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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