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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7b1b2aa3e13ae0e099ec6f727b24567f08ee2860db6ecba744c2deb836357d' 
  AND token = '/uiWDLltmrN6yl9mEwzw5yZZ7VvLCsNIDW0FA8XQkik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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