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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56b715b41c599cd108f381e3104167fc74417224ce635ef566da0e140642c78' 
  AND token = 'immlzd8/U5lMAn3pAPt/JCd+qSF8rNo482T2BV2cQcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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