SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f606349f6b2c1f614594c9e87ac4c3bddf88c7113241dcb910b081b388a477f2' 
  AND token = 'eNUX/jaUUD3L+B/C9+9w/P4iszkWKeBtq6OGY1htGHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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