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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2f082d8d75c68c2683c13e2f3027fc80926492bf496f3c89bf82ab1babcbc7' 
  AND token = '9fGPAMz8MdKk1tOCOsf/+pw3ZGXGAHL6xHmkKuD5xhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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