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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124557156632e5fcb0babf80c4731ad0574a1d93b1e3498eccafc3c55714a736' 
  AND token = 'E8+m9JHyl6wsqlsPVJJBdueJxNAkdaATlHcbjT6etiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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