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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efa762bb59768057a9a4afabb0d0566df940e98402aadcba9ccef649ddb34f6' 
  AND token = 'IxjVHNsuRTs0iZbWQbPEGWVdQHsEr/hq7n/N/Dt5jH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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