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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284cdb9396bb3e405100dae88502351fd3dd0132c3e995dd27990c08ff52ebf' 
  AND token = 'kTHFuoz71nFjkk1raZK6uQqvaFL1T6icGy9Iwt0LFZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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