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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9b811cad7da4aa71081875e23fea6df868adc8cdbf3682db2c92264aa3c18d' 
  AND token = 'LRWdueLV06s4OmntUvHye4c/KjVSDa6leqU1OLIGHqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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