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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1ef18836d34bb6d4fe47160d93640a4cf27b383af203b378b03d82e3d0c25a' 
  AND token = 'sxWkBHrJoEgKfk1xuGIRE0hzjOC0OLuMc56TZYb3iQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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