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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eee6b7d1088c9b45eb60e922f5afd6b2ad6dadacded79318c3dcbf2880d1b9e' 
  AND token = 'eQlvXEH1SIRlm7YlDgk55AWFSwBdSyuXHvPI16YL3cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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