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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d39cd7c5d368afd26cd22c3a7be3f259f88edee954f7f4d003326635af72cc' 
  AND token = 'g5Bl4osYE+ZzSR48qb+Yp4h1TLvd6Ky5A7gvl+tPbEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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