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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf4454e75c3ce9c50e77924c5b3467db01be8eb3e04874508af846566574a5' 
  AND token = 'xfDJaWFVW8U/F9W5nE/MaNll9MLMBTeCcE9kVMcclSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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