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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dbaff55693aadd64d5cdb145dd0ed1caeea82f792dbcf8da7e5eeb89ddce68' 
  AND token = '99s3JEHasc72r9aVU6cI2KErSMvk5Lm0JKTo63+M9kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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