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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2125fe09e3272c2fb8440b52262c983c140feb0ed6adf0d2a76f078a709024e4' 
  AND token = 'bjckTUVKsu9rVPJfP99G0Hd03mifq6KpneL8mHSr9Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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