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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c9ef8195a46fca1dce6419ec6fadb69c9428694eb8f2977c50ecd7f939bd79' 
  AND token = '8/eqz5rSvGCaeUlH0j6MKITTc6ABATbEe6+Pn2YXdDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00221

JSON explain

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