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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b6bd4ab6a57d062247eb49ae4435bc7e2622f83b472f957a975510c24c7422' 
  AND token = 'rh+1gFTrUmUjOLvATkP2ET+XXJLs+SPPnt/Lu3GfMHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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