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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161c9840258801eaccf61735e76e9cde885ffc07dd985cdd68e5392377e8c919' 
  AND token = '/3Ocs/N8V8iZmtYVhzYhd/seE2QaIb8QhXk+fBbLQpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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