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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab238083cc6a24b41ac091592b08fb719f89421720f533c4624a1b31dd16e253' 
  AND token = 'bKhWpHj0JAuhou3m42rSPELxiSr0gAD9eTQskCxWDf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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