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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b09ae2b8987e4b0617390e8dcbb5361ca8984bc5cd9e34d8034ef738fe77ab4' 
  AND token = '4LLEstXmrSUZkJudmyL8GxCDtO7uMkeL5ihi8ltMy/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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