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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae7430138a2fee2617b058d02d735976bf5aaa45ec724c38de8f6dfafcc2300' 
  AND token = 'TISjcXHa1HQbZ9LNaBquXhohsymYNKOfusFjKe3DBoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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