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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b958e6272060a8974bd0f32a7298691056a8680a5b79682bf6e16ce82f937ad' 
  AND token = 'o0tfMpW2G3YXa9LXFcPIXCWEU0d0Jk0ZP6TS9/u52Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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