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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414f3f9c4c4773779aba91b199f1ae276d79ac9dafe00b43ea883855fa51ccbd' 
  AND token = 'gihb5FkbbKUq0NY/Gx2SC/N4Kzg7fRGsB655DuoOlk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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