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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023ef902cb7bd49213de98c4ee7a9e723ce6627cbd46f1b2ef1688324f40d141' 
  AND token = '7P2TMPHgBPFj/P1Y7CPtM4tzSaL2ADUTi7SzSkJPYpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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