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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19db4a13d8ff9440d1890866af254b624aa4704b9b18e8d255644f4e6232ff47' 
  AND token = '60vjhdZyI6xT9Ab6klOYIjW+8ZJTy46vyb4Z5t+vkhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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