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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7f1fffe2babcfd530c7fdd35101541c1319e8091f06113b9d0c6798554fe19' 
  AND token = 'WqmEjNw5esSGefvlLqTDlTMe4hUU5c5M19yTXqoFyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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