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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bfc06b37d5e3dbf92b091bd2db35a07fe6c962159774ff59fc73b1a0097235' 
  AND token = 'ZEq7l9E3vK2idm3cJZ3ZLzbpsf0ys8+mAGQt5Y72CnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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