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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9d4228c9183a85d74345923bd2e5f247d454e012f80cb4f18e65d1a3a4b514' 
  AND token = 'nk5KScYbToaF5nFtOTJqVzGvaRy1SpqzHChCiFwtiv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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