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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebba075eb313f54f38a25c8cd4ee2691a80499c48ea19222cc3355b04575d824' 
  AND token = 'Ww5Uqa7yGRgjbBfc3SkRLeafUiQXfN5Y+iVlLbFbS0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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