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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f6ac407fa4664bc5e3d331c20efacbaf11446fabe9a0bd00e6931e51523952' 
  AND token = 'SS+kYDuCHH2l5m711UTJN5OdsSn+QzEAw7sI8qy5YVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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