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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d15d2279442515af158ca684e080ed0be9d878ab3727965deba2a9432eae94' 
  AND token = '1X1/c9VknN4yVtt3gPaaWzY11j8xW2XY1gq0QgIB9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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