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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8d454b8d221c7efa49258f94750f1c6eb7b09e6ebfcf28b35c66a804965061' 
  AND token = 'hiLa6mwiDhwPqdUuHKY0QXavoU15CexpszNY000FtUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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