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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae299eb445d33865e6cccf03fd13ba677a63c47b9a8afa4520bd878d83b3002f' 
  AND token = '65Ao3udN7erjxXpeEepSPr2TjJXnKGBgpbMit0FakQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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