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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38114c4aea8be3bb3b803555a0e98c066555c059ef02b9dd59f58e098c40f4ec' 
  AND token = 'Gw5JG8stmh2te61XaVQeEov16lHIdWro0eGeTJA6xQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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