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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aec413b59fb72e9762b6fb3af2c79efe86276518e9a51a7f1b9c8caa402aee4' 
  AND token = 'deL6qHq/6H01Sz0BTH04AUceB3LIknhAUIojsH/lmso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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