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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7f5716225aae7bdc7689aefeed03f6e0e8100a1269bcfb720d8867e6cd8eac' 
  AND token = 'eB78DXuSQ5IR5BbCzKuR75mLlHOJDrxeGk4TwDpWtTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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