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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3137648e0d4bfe0a271e2bbfba5dfb7b9af88bf988127642838d64daf173033a' 
  AND token = '1aJRd5WDzWyoq8HH0Y7bq5SE9y6Gou4O8DR54ikSoEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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