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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72696d84fed27458629db6d32481a2b8181a18107fd36b293cfc343132dd273f' 
  AND token = 'pbuNrwQmsTsNugAuf2h5kAyEqzbDgTLWerKg6g5GttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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