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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f45adc56557174fd9afdc6b7b095fe130bf1e35781168a6b4a4c95d485c8e54' 
  AND token = 'gy7ydsbMLTFu/UrjL/bcLCqh0w5xCtqh++5kOsqkC80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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