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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc74678f61790f5efddd2d5cd2382f115fa86a511d722c5458b65a74661ee24' 
  AND token = 'NGt926EV+O3hW8oLUXSantZwKTVYFAhORVuQ3Fn0Ozc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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