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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a93845fe620bb3234a0a50bf9dc862a76179c82d396a28c5bbc414da872bc0' 
  AND token = 'V3eZhWvXMe5cebwKfa6TIx2KIf3Ba4lctDThzf3c98c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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