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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214d4c19116550aadd6e824d59da13f8b04daa31af6e00576b7d4dd9945dbee0' 
  AND token = 'qXgN5YxJlrD34whfPg+Jw0mRcysV+HwI/M05bYwc5IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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