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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d09be7caadaf256c5fd81c338832e7b1452c85acaff96b37b24c212ee17335e' 
  AND token = 'Br2pPwIwZXY1/f+BoP7+AiTMai6noRPOf7zoG878Obg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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