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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f8a3521e603439e194f7de498e87e24b6951c049998538a626f3fc75b2f872' 
  AND token = 'Hh2rftiEfKtrz7jIIy8vNRuiqK2x9NnLJFJvL1YB5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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