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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be204c69c2dce649949263d2d500ef7f71191bdd063d74e1205d141dbbf41a94' 
  AND token = 'P6jjt5vtwT1ieY7Rw/4VMS/TUE33hwsnQLLjqsbuuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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