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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8436888981ed2798571b888d9d65698b3f55e26da6837500fa34336b025f1f' 
  AND token = 'ScBzKtfU2A/4duk/1ps4IN9sJGhwENg+gXbb04AI9uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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