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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132651734626b03b666742eb5b76ee9c784396e4f1f7b176cd80824d19df999e' 
  AND token = 'K+W35Bdoj4l1tlblKWnMPhCTff46rU5OkZwxUrXbSuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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