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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8474e72be739cdd864ec53a157c3826d163533a0a0243734fe0f2b84bdc34323' 
  AND token = '7o0YXiMaWNnDYnlf734d6ma8RQQE3bixaG91hJH6Fs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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