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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6ae3664d17cfa421b5ea4b144a4419695c1f6a58bc0f6c9b3772d3941e77e2' 
  AND token = 'mDCfeihBybL7hN0CVqEVbzhuDbf85d+N8LNPeSYlXmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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