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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3473525fc912eb70f2bea0c6412464a11087ba728e986d7825e5eb6c20bc302' 
  AND token = 'd+sSG21Va8KfXLajFUC/5qw+QTm7feNp8kgXt19qlVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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